Jeff has it times 2. They are best grown with lots of good sun light to develop"bleach out" some color. They can be grown indoors but, again, without lots of good light will change appearance. Like other succulents, they are somewhat drought tolerant, will grow in almost any good draining mix and don't require too much food or attention. With time the stalk elongates, gets top heavy and will require beheading!

Oh, no. Low CA desert: not full sun in summer! They are not cacti. In habitat Echeveria grow mostly in long grass or on shaded cliffs/slopes or in dappled shade. Right along the coast they are fine in full sun, but even 10 miles inland, morning sun/afternoon shade is about as much as they like. Winter in the desert probably morning sun/afternoon shade is ideal.